The compression ratio is the ratio of the maximum to minimum volume in the cylinder of an internal combustion engine. The compression ratio for a diesel engine usually ranges between 15:1 and 23:1. The reason being for this high compression ratio is purposely higher causing the temperature of the air to rise. A four-stroke engine has a camshaft which is used to rotate at half the speed of the crankshaft. (1:2 Ratio) Therefore the crankshaft will need to rotate twice for the camshaft to make one rotation. The four-stroke cycle, is a cycle that uses intake, exhaust, fuel injection, compression and power to accomplish one complete cycle of a diesel engine. The piston moves upward and approaches before top dead center (BTDC) as the camshaft lobe starts to lift the cam follower. As the valve is taken up the intake valve is then pushed downward and the valve opens. The intake stroke begins while the exhaust valve is still open. The flow of exhaust gases creates low pressure condition within the cylinder and will pull in fresh air. Compression occurs after bottom dead center (ABDC) the intake valve starts to close. At bottom, top, dead center (BTDC) the intake valve is then fully closed. The air charge at this point is at normal pressure. The piston at bottom top dead center (BTDC) has traveled half of its stroke reducing the volume in the cylinder by half doubling the temperature to 160F. With a piston area of 9.6 in. sq. the pressure in the cylinder releases a force of 7135lbs
Diesel mechanics tune and diagnose engine troubles. Diesel mechanics work full time in a shop, overtime is very common. When it comes to working on diesel, it depends on the area, rural areas tend to have more farm equipment and trucks. In cities, it is more common to work on semis and heavy machines. They work 40 hour weeks minimum, also diesel mechanics do more than work on engines. Things such as brakes, tire rotation, driveline, And even wiring. Most start off between $12-$28 an hour, the median pay is $18.50 an hour which is about $45,690 a year. A similar career is a heavy vehicle and mobile technicians which average about $47,690 a year. In 2010 the job increase for diesel mechanics was 15% and by 2020 there will be 35,000 jobs added
The Cummins diesel engine was manufactured in the year 1919 by its creator Clessie Cummins. The Cummins was put in a variety of vehicles and the most common are in the dodge ram 2500, 3500, 4500, and 5500 series rams. It is also put into more heavy-duty trucks such as Peterbilt semis. The reason people choose Cummins over Chevy’s Duramax or Ford’s Powerstroke is because Cummins’ are built to last longer meaning they can go more hours without maintenance. The Cummins diesel engines have several different designs, and a number of different models, and assembling one takes money, time, effort, and knowledge.
of two. The strokes are Intake, into which a mixture of gas and air are
Diesel is going to be the fuel that will control the world just like gasoline is today. Clean diesel is something that seems unreachable but it is closer than people think. Diesels now are Cleaner than ever and it it going to out do any other form of power for cars. Although other fuels and forms of power produce no emissions, diesel engines can be made to produce less harmful pollutants and be more efficient. There may be a few negative characteristics about diesel engines. But, the positive characteristics that they have out weight the bad things about them. To keep the diesels clean the process of how they work needs to be known.
The continuing rotation of the crankshaft drives the piston back up, ready for the next cycle. The piston moves in a reciprocating motion, which is converted into circular motion of the crankshaft, which ultimately propels the car. Gas engines usually have about the same about of horsepower as they do torque. The diesel engine usually has twice as much torque as it does horsepower, thus it is the better hill climber and load carrier.
Conventional wisdom was that diesel was the only way to deliver significant fuel economy improvements in trucks. However, the growing emergence of direct-injected and turbocharged gasoline engines have made the fuel economy difference between gas and diesel engines much smaller than before. Seredynski said that regardless of fuel, the end goal is the same: maximum power from the minimum amount of fuel. The Ram 1500 Eco Diesel is the current full size pickup mileage champ at 20/28 mpg in EPA testing, but Ford's new 2.7L Eco Boost V-6 gas engine is likely not be far behind. Another enabling technology that has increased economy on both gas and diesel engines are transmissions with much higher gear counts, with six speeds now considered the
As a child I would always want to go with my Dad in his semi. Any time he would be leaving in it I would always beg to go. Then as I got older when he would work on it I would always be right there helping him. Sometimes I would just be handing him tools other times I would be right next to him helping take parts off and on. Ever since a young kid I have always wanted to be a diesel mechanic.
Does diesel mechanics interests you? If so keep on reading and find out a lot of helpful tips to get you started today. It takes a lot to be diesel mechanic including going to school and getting certificates for different type of diesel engines. Have to have so many class hours also science and technician skills and high school diploma .What all do you have to have to be a diesel mechanic?
First of all, Many people wonder exactly what a diesel technician does for a career. A diesel tech works in a well ventilated shop with loud or noise repairs. You have to go to a vo tech school and get a high school diploma. A diesel tech makes around 50,000 dollars a year. Becoming a diesel tech career path because building trucks is interesting (Trulity).
As our technology and economy increases more companies and every day drivers have started converting to diesel engines. Diesels provide great mileage, the “fuel is efficient and energy dense.” (Pros and Cons) In addition, there are less tune ups and the engines are built more ruggedly to withstand the higher compression. With the increase of diesel engines this opens up more job opportunities with the need of more workers. For one to meet the requirements to become a diesel mechanic they need to have formal training, adapt to the work environment, meet the skills and traits and understand the outlook and are accepting to the pay.
High performance diesel truck owners are an elite group, but not everyone understands the power the ins and outs of rebuilds and upgrades. If you're thinking about boosting the performance of your truck with add-ons - you might want to reconsider.
Some people look at Secretaries, Teachers, Police, and Diesel Mechanics as overpaid and over appreciated. Even though secretaries work a full week their salaries are still higher than a normal man’s wages for a year.Teachers might be seen as overpaid or over appreciated, since all they get paid for is teaching the youth of America, the salaries need to be cut down a little bit to save money. Police officers could be looked at overpaid or over appreciated,since they sit around the office and pig out on donuts. Some officers are abusive and pitiless when an innocent citizen even tries to talk about a problem he or she has with that specific officer.Some people argue that diesel mechanics make much more money than they should, since all they do is work on Diesel engines for a living.
The piston then travels down pulling in fresh air, (third stroke), after the piston bottoms again it travels up compressing the fresh air, (fourth stroke). The fuel is then injected and one cycle is completed in 720 degrees or two full rotations of the crankshaft.
This equation is representative of a stoichiometric air fuel ratio (14.7:1). However under normal driving conditions an engine will encounter lean conditions when cruising on the highway (better milage) and rich conditions when accelerating (better power). The lean condition results in oxide and harmful nitrogen compound production. Rich conditions result in carbon monoxide production. For this reason a catalytic converter is used on most larger engines.
Whereas ordinary diesel direct fuel-injection systems have to build up pressure anew for each and every injection cycle, the new common rail (line) engines maintain constant pressure regardless of the injection sequence. This pressure then remains permanently available throughout the fuel line. The engine's electronic timing regulates injection pressure according to engine speed and load. The electronic control unit (ECU) modifies injection pressure precisely and as needed,